EP3127763A2 - Procede de validation de fonctionnement d'une unite de detection, unite de detection et systeme tachygraphe - Google Patents

Procede de validation de fonctionnement d'une unite de detection, unite de detection et systeme tachygraphe Download PDF

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Publication number
EP3127763A2
EP3127763A2 EP16181052.8A EP16181052A EP3127763A2 EP 3127763 A2 EP3127763 A2 EP 3127763A2 EP 16181052 A EP16181052 A EP 16181052A EP 3127763 A2 EP3127763 A2 EP 3127763A2
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EP
European Patent Office
Prior art keywords
control device
sensor unit
signal
validation
sensor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP16181052.8A
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German (de)
English (en)
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EP3127763B1 (fr
EP3127763A3 (fr
Inventor
Thomas Grill
Roland Lange
Detlef BÖHLER
Thomas Pfaff
Norbert Köhn
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Aumovio Germany GmbH
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Continental Automotive Technologies GmbH
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Publication date
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Publication of EP3127763A3 publication Critical patent/EP3127763A3/fr
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Publication of EP3127763B1 publication Critical patent/EP3127763B1/fr
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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P1/00—Details of instruments
    • G01P1/12—Recording devices
    • G01P1/122—Speed recorders

Definitions

  • a method for operating validation of a sensor unit for a vehicle as well as a corresponding sensor unit for a vehicle are specified.
  • the invention is characterized by a method for operating validation of a sensor unit for a vehicle.
  • the sensor unit comprises a sensor element, a communication interface, a first control device and a second control device.
  • the first control device comprises a memory in which program code and / or program configuration data for operating the sensor unit is or are stored.
  • the second control device comprises a memory in which a copy of the program code and / or a copy of the program configuration data is stored for operating the sensor unit or are.
  • a measuring signal is detected by the sensor element.
  • the measurement signal is representative of a speed and / or a traveled distance of the vehicle. Additionally or alternatively, the measurement signal can also be representative of other measured variables such as weight, pressure, temperature and / or location.
  • a validation signal is determined by the first control device and the second control device.
  • the respective validation signal is representative of at least part of the program code and / or program configuration data stored in the respective memory.
  • At least one of the validation signals is provided to the other control device.
  • a validation characteristic value is determined by the respective control device.
  • a sensor signal is determined by the first control device and / or by the second control device.
  • the sensor signal is provided via the communication interface of the sensor unit.
  • the operation validation of the sensor unit contributes to the safe operation of the vehicle.
  • the operation validation contributes to a tamper-free and trouble-free operation of the sensor unit.
  • the validation signal may comprise at least part of the program code (s) and / or program configuration data stored in the respective memory.
  • the validation signal includes only a checksum, such as a so-called "hash code” or a CRC (Cyclic Redundancy Check) checksum, which is representative of the at least one part the program code (s) and / or program configuration data stored in the respective memory.
  • the validation characteristic value is in particular representative of a match of the at least one part of the program code (s) and / or program configuration data stored in the respective memory.
  • the validation characteristic allows consistency of code to be checked for consistency without a great deal of time and computation, so that manipulation of the program code or an error in the program code can be detected.
  • the program code can also be called an application code.
  • the program configuration data may also be referred to as application configuration data.
  • the configuration data specify, for example, a variant of the sensor unit.
  • the configuration data include limit values, characteristic fields and / or enabled functions.
  • the at least one part of the program code and / or program configuration data stored in the respective memory comprises, for example, a predetermined amount of data, for example a data packet between 1 byte and 8 bytes, or an integral multiple of 8 bytes.
  • the part of the program code (s) and / or program configuration data stored in the respective memory may also comprise the or the complete program code and / or program configuration data stored in the respective memory.
  • the operation validation of the sensor unit can take place during operation of the sensor unit.
  • the operation validation is not carried out merely upon updating the program code (s) and / or program configuration data stored in the respective memory.
  • the method is cyclically repeated during operation, for example, so that the complete program code and / or the program configuration data can be checked for consistency at least after the method has been carried out several times.
  • the validation characteristic value is determined by the second control device.
  • the second control device provides the first control device with a request signal which is representative of a memory address of the at least one part of the program code and / or program configuration data stored in the respective memory, for which the first control device determines a validation signal. Subsequently, the validation signal representative of the at least one part of the program code and / or program configuration data stored in the memory of the first control device is determined by the first control device and provided to the second control device.
  • a comparison of the validation signal of the first control device and the validation signal of the second control device for determining the validation characteristic value can advantageously be carried out in the second control device.
  • the second control device is designed as a secure microcontroller, so that the determination of the validation characteristic value can be carried out particularly reliably with respect to manipulation attempts.
  • the measurement signal is assigned to the sensor signal.
  • an encoded measurement signal is determined by encoding the measurement signal, which is assigned to the sensor signal.
  • the measurement signal enables unencrypted efficient and timely processing of in the measurement signal contained measurement data.
  • the encrypted measurement signal enables a tamper-proof transmission of the measurement data contained in the measurement signal.
  • the measurement signal together with the encrypted measurement signal enable simple verification of the unencrypted measurement data and their efficient and timely processing.
  • the measurement signal may be, for example, a real-time signal (so-called "real-time signal”), which is transmitted by way of example as a rectangular signal.
  • the encoded measurement signal can be, for example, a data signal (so-called "data signal”).
  • the sensor signal is a signal according to the industry standard ISO16844-3 specified protocol (in the version of 01.03.2006).
  • the encoding of the measurement signal is performed by the second control device.
  • the encryption can be done very safe against manipulation attempts.
  • the encryption may be dependent on the validation characteristic.
  • the encrypted measurement signal is determined by encrypting the measurement signal such that it is representative of the validation characteristic value.
  • an additional signal can thus be dispensed with in order to output the validation characteristic value.
  • the encoding of the measurement signal in this case comprises a process in which the measurement signal as an input signal to an encryption unit is present and the encrypted measurement signal is provided as an output signal.
  • the encoding of the measurement signal thus includes both a process in which the measurement signal is encoded with a key, so that when decrypting with a key corresponding to the key, the decrypted measurement signal is readable, so can in particular match the measurement signal, as well as a A process in which a signal deviating from the measurement signal is encoded with the key, a process in which the measurement signal is encoded with a key other than the key, and a process in which a signal different from the measurement signal is encoded with one of the key deviating key is encoded, so that when decrypting with a key corresponding to the key, the decrypted measurement signal is unreadable, so in particular does not match the measurement signal.
  • the encrypted measurement signal is assigned a predetermined signal when a manipulation attempt is detected, which is representative of a manipulation of the program code and / or the program configuration data.
  • a signal deviating from the measurement signal is assigned to the encoded measurement signal, so that at least one error or a manipulation in a process chain between the sensor element and the control unit is detected during a validation of the measurement signal, for example by a control unit arranged externally to the sensor unit can.
  • the control unit determines a confidence index which is representative of this fault or a manipulation of the first sensor device and / or of the received sensor signal.
  • the at least one part of the program code (s) and / or program configuration data stored in the respective memory is randomly selected.
  • the invention is characterized by a sensor unit for a vehicle.
  • the control unit comprises a sensor element, a communication interface, a first control device and a second control device.
  • the sensor unit is designed to carry out an operation validation of the sensor unit according to the first aspect.
  • the operation validation of the sensor unit contributes to the safe operation of the vehicle.
  • the operation validation contributes to a tamper-proof and fail-safe operation of the sensor unit.
  • the communication interface of the sensor unit can be arranged, for example, in a structural unit with the first or second control device.
  • the communication interface of the sensor unit can be arranged, for example, separately from the first and second control device.
  • the second control device is designed to encrypt data included in the sensor signal. This contributes to the fact that the data comprised by the sensor signal provided by the sensor unit can be verified and / or transmitted securely. In particular, this allows increased security of the sensor unit against manipulation attempts.
  • the second control device is designed as a secure microcontroller. This contributes to a particularly high security of the sensor unit against manipulation attempts.
  • the second control device can also be referred to as a so-called "secure microcontroller”.
  • the second control device has an encryption module in this context.
  • the second control device satisfies the Common Criteria Level EAL4 + (Evaluation Assurance Level) according to ISO 15408 Version 3.1 or higher.
  • the invention is characterized by a tachograph system for a vehicle.
  • the tachograph system comprises a sensor unit according to the second aspect and a tachograph with a communication interface.
  • the communication interface of the sensor unit is signal-wise coupled to the communication interface of the tachograph.
  • the sensor unit is designed to determine a sensor signal according to the first aspect and to provide it via the communication interface of the sensor unit.
  • the tachograph is designed to determine a confidence parameter as a function of a sensor signal received via the communication interface of the tachograph.
  • the confidence index is representative of a manipulation of the first sensor device and / or the received sensor signal.
  • the manipulation and fail-safe operation of the sensor unit enables safe and reliable operation of the tachograph system, so that a contribution to the safe operation of the vehicle is made.
  • a contribution to a high level of manipulation and reliability of the tachograph system as well as its simple and cost-effective production be made.
  • the tachograph system can be produced in a particularly cost-effective manner.
  • the tachograph may in particular be a digital tachograph.
  • FIG. 1 shows a schematically illustrated tachograph system 11 for a vehicle.
  • the tachograph system 11 comprises a sensor unit 1, which can also be referred to as a so-called "Secure Speed Sensor”.
  • the tachograph system 11 further includes a tachograph 9, which may also be referred to as a "digital tachograph”.
  • the sensor unit 1 and the tachograph 9 are each assigned a communication interface 4a, 4b, via which they are signal technically coupled to each other.
  • the communication interface 4a, 4b is an interface according to ISO16844-3 (in the version of 01.03.2006).
  • the sensor unit 1 comprises a sensor element 3, which is designed to detect a current speed and / or a traveled distance of the vehicle.
  • the sensor unit 1 further comprises a first and second control device 5, 7.
  • the first control device 5 is coupled to the sensor element 3 and may also be referred to as an "application microcontroller".
  • the second control device 7 is signal-technically coupled in particular bidirectionally with the first control device 5.
  • the second control device 7 is preferably a secure microcontroller (so-called "secure microcontroller").
  • the communication interface 4 a of the sensor unit 1 is arranged separately from the two control devices 5, 7.
  • the communication interface 4 a of the sensor unit 1 may also be formed in a structural unit with one of the control devices 5, 7, in particular the first control device 5.
  • the first control device 5 comprises a memory in which application or program code and application or program configuration data for operating the sensor unit 1 are stored.
  • the second control device 7 also comprises a memory in which the application code and the application configuration data are stored completely mirrored to the first control device 5.
  • the secure microcontroller For checking the application code, it is additionally stored in the secure microcontroller. Cyclically, the secure microcontroller provides a random code area for review. For example, both microcontrollers calculate a CRC checksum via this random code area. The checksums are exchanged and compared. For checking Randomly selected code areas can be compared cyclically. In addition to this, so that the content does not have to be exchanged for comparison, a checksum can be calculated and compared with one another via a randomly selected code area on the secure microcontroller and the application controller. This requires only a low computational effort, since the selected code area is stored in both microcontrollers and thus can be compared directly. Due to the random selection of the code area to be checked, a complete check is also given if a cycle is interrupted, for example due to a power interruption. A consistency statement can be made immediately over the selected area.
  • the sensor unit 1 is for example associated with a data and program memory in which a program is stored, which is described below with reference to the flowchart of FIG. 2a is explained in more detail.
  • the program is started in a step S1 in which, for example, variables are initialized.
  • a measurement signal is detected by the sensor element 3, which is representative of the current speed and / or the traveled distance of the vehicle. Additionally or alternatively, the measurement signal can also be representative of other measured variables such as weight, tire pressure and / or location of the vehicle and / or a temperature of a component assigned to the vehicle.
  • the measurement signal is subsequently provided to the first control device 5.
  • the program is continued in a step S3.
  • step S3 a part of the memory in which the program code and / or the program configuration data are stored is selected at random. For example, in this context, a memory address or a memory address block is randomly selected. Depending on the selected part of the memory, a validation signal is detected is representative of the stored in the part of the memory of the second control device 7 program code and / or the program configuration data. The program is then continued in a step S5.
  • step S5 a request signal is transmitted from the second control device 7 to the first control device 5, which is representative of the selected part of the memory of the first control device 5 for which the validation signal of the first control device 5 is to be provided.
  • the first control device 5 determines the corresponding validation signal. The program is then continued in a step S7.
  • a validation characteristic value is determined by the second control device 7 as a function of the validation signals.
  • the validation signals are, for example, a short text block or a check sum, which only have to be compared. For example, if the validation signals match, the validation parameter will be assigned the value "one". Otherwise, the validation parameter is assigned the value "zero", for example.
  • the program is then continued in a step S9.
  • a sensor signal is determined as a function of the validation characteristic value and the measurement signal provided by the sensor element 3.
  • the validation characteristic value assumes the value "one”
  • an encrypted measurement signal is determined by encrypting the measurement signal.
  • the encrypted measurement signal is provided together with the measurement signal as a sensor signal at the communication interface 4 a of the sensor unit 1.
  • the validation parameter takes on the value "zero” becomes an encrypted one Measured signal determined by a deviating from the measurement signal is encrypted.
  • the encrypted measurement signal is provided together with the measurement signal as a sensor signal at the communication interface 4 a of the sensor unit 1.
  • the program is then continued cyclically in step S1.
  • the tachograph 9 is for example also associated with a data and program memory in which a program is stored, which in the following with reference to the flowchart of FIG. 2b is explained in more detail.
  • the program is started in a step S11 in which, for example, variables are initialized.
  • the sensor signal provided by the sensor unit 1 via the communication interface 4a is detected.
  • the sensor signal is in particular divided into a received, encrypted measurement signal and a received measurement signal.
  • the program is continued in a step S13.
  • step S13 a decrypted measurement signal is determined by decrypting the received, encrypted measurement signal.
  • the program is continued in a step S15.
  • step S15 the received measurement signal is compared with the decrypted measurement signal and a confidence parameter is determined.
  • the real-time signal in this cycle can be trusted, an operation validation of the sensor unit 1 and a process chain to the tachograph 9 is intact.
  • the program is then cyclically continued in step S11. Otherwise, the real-time signal can not be trusted.
  • the confidence index is then representative of the fact that an error or a manipulation of the first sensor device 3 and / or the received sensor signal is present. For example, the program then enters a fault or maintenance state.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Time Recorders, Dirve Recorders, Access Control (AREA)
EP16181052.8A 2015-08-03 2016-07-25 Procede de validation de fonctionnement d'une unite de detection, unite de detection et systeme tachygraphe Active EP3127763B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102015214791.6A DE102015214791A1 (de) 2015-08-03 2015-08-03 Verfahren zur Betriebsvalidierung einer Sensoreinheit, Sensoreinheit und Tachographsystem

Publications (3)

Publication Number Publication Date
EP3127763A2 true EP3127763A2 (fr) 2017-02-08
EP3127763A3 EP3127763A3 (fr) 2017-02-22
EP3127763B1 EP3127763B1 (fr) 2018-03-07

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EP (1) EP3127763B1 (fr)
DE (1) DE102015214791A1 (fr)

Cited By (1)

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EP3499469A1 (fr) * 2017-12-14 2019-06-19 Continental Automotive GmbH Procédé de détection d'une manipulation sur un appareil d'enregistrement et dispositif comportant un détecteur de mouvement

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DE102019209355A1 (de) * 2019-06-27 2020-12-31 Audi Ag Steuergerät für ein Kraftfahrzeug und Kraftfahrzeug
DE102020216530A1 (de) 2020-12-23 2022-06-23 Continental Automotive Gmbh Tachographensystem für ein Kraftfahrzeug, Kraftfahrzeug und Verfahren zum Betreiben eines Tachographensystems

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Publication number Priority date Publication date Assignee Title
DE19955545A1 (de) * 1999-11-18 2001-05-23 Volkswagen Ag Steuersystem für ein Kraftfahrzeug
DE102004028338A1 (de) * 2004-06-11 2006-01-12 Siemens Ag Tachograph
DE102006036066A1 (de) * 2005-09-22 2007-04-05 Continental Teves Ag & Co. Ohg Kontrollgerät für ein Kraftfahrzeug, insbesondere Tachograph
DE102006040297B4 (de) * 2006-08-29 2010-12-09 Continental Automotive Gmbh Geschwindigkeitserfassung für ein Tachographensystem
JP4506868B2 (ja) * 2008-04-23 2010-07-21 株式会社デンソー 電子制御装置
DE102009051350A1 (de) * 2009-10-30 2011-05-05 Continental Automotive Gmbh Verfahren zum Betreiben eines Tachographen und Tachograph
US8521468B2 (en) * 2010-08-25 2013-08-27 GM Global Technology Operations LLC Diagnostic method for use with a vehicle dynamic control system (VDCS)
US9276738B2 (en) * 2011-10-20 2016-03-01 Continental Automotive Gmbh Digital tachograph
DE102012224194B4 (de) * 2012-12-21 2018-08-02 Continental Automotive Gmbh Steuersystem für ein Kraftfahrzeug

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3499469A1 (fr) * 2017-12-14 2019-06-19 Continental Automotive GmbH Procédé de détection d'une manipulation sur un appareil d'enregistrement et dispositif comportant un détecteur de mouvement

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EP3127763B1 (fr) 2018-03-07
EP3127763A3 (fr) 2017-02-22
DE102015214791A1 (de) 2017-02-09

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